Yes, please take your depression very seriously. Ask your doctor if there are any anti-depressants that are weight-neutral... Of WAY more importance at the moment, though, is your feeling better!
Like Barb said, stick around - we'll do what we can to help you!
That is a question that only your doctor can answer. If you go back on anti-depressants, maybe you will have to work a bit harder to lose the weight, but it will be worth it because you will feel better.
Do see your doctor. And stick around - we'll help you all we can.